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Status Future consideration
Workspace z/OS
Categories Communications Server
Created by Guest
Created on Jun 24, 2021

RELATED IDEAS

Provide AT-TLS capability to connect with different SNIs to same RemoteAddr

Cloud service providers can provide multiple instances of the same service behind an ingres node that can be addressed by specifying their individual virtual host names for each instance in the SNI headers (server name indicator).

Multiple virtual host names (each representing a different service or instance) can resolve to the same IP address. Each virtual host name however can also resolve to multiple IP addresses if load requires to provide multiple service nodes.

AT-TLS allows specification of SNI headers when initiating outgoing connections through ClientHandshakeSNIList. This ClientHandshakeSNIList can be activated for example for a specific RemoteAddr. However it is not possible to connect to different virtual hosts at the same RemoteAddr with different SNI headers if there is no other unique identifier (like different remote or local ports).

Since the original host name is no longer available in the filtering done by AT-TLS (based on IP address and port), the target SNI needs to be passed by the application when the connection is initiated and the socket is created.

Idea priority High
  • Guest
    Reply
    |     Dec 6, 2024

    When using AT-TLS for CICS outbound connections we found that there was no way to distinguish between connections for different virtual host to the same cloud services provider from the same CICS region (i.e. jobname). CICS TS 5.6 provided SNI support so we have stopped using AT-TLS because it is of no use for this kind of connection unless this enhancement is implemented.

  • Guest
    Reply
    |     Aug 4, 2023
    This item is unlikely to be given high enough priority to be placed into product plan.

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